PDF Splitter

import PyPDF2
from PyPDF2 import PdfReader, PdfWriter

file1 = r"C:\Users\223117394\OneDrive - General Electric International, Inc\Documents\python docs\Failed certs X22318 & X24894.pdf"
file2 = r'C:\Users\223117394\OneDrive - General Electric International, Inc\Documents\python docs\Failed certs X22318 & X24894 - 2.pdf'
read1 = PdfReader(file1)
read2 = PdfReader(file2)
Write1 = PdfWriter()
Write2 = PdfWriter()

def PDFsplit(pdf, splits):
    pdfFileObj = open(pdf, 'rb')
    pdfReader = PyPDF2.PdfReader(pdfFileObj)
    start = 0
    end = splits[0]
    for i in range(len(splits)+1):
        pdfWriter = PyPDF2.PdfWriter()
        outputpdf = pdf.split('.pdf')[0]+str(i)+'.pdf'
        for page in range(start, end):
            pdfWriter.add_page(pdfReader.pages[page])
            with open(outputpdf, "wb") as f:
                pdfWriter.write(f)
            start = end
            try: 
                end = splits[i+1]
            except IndexError:
                end = len(pdfReader.pages)
    pdfFileObj.close()
def main():
    pdf = r"C:\Users\223117394\OneDrive - General Electric International, Inc\Documents\python docs\Failed certs X22318 & X24894.pdf"
    splits = [3]
    PDFsplit(pdf, splits)
    
if __name__=="__main__":
    main()